130 W. J. MOENKHAUS 
does not present all intergradations. In other words, one does not 
find that among a large number of brothers and sisters some pairs 
whose eggs only partially hatch and other pairs that range in this 
respect, on the one hand, to perfect fertility and, on the other, to 
complete sterility. The fertility is either completely lost or it is 
of a high degree. Furthermore, when we compare the inbreds with 
thenormals (not inbred) in regard to the percentage of eggs hatched 
no essential difference is observable. It would seem, therefore, 
TABLE 1 
Inbred (low fertility) 
| | 
| NUMBER OF PER CENT OF 
pa «fon RE Se, ne Ocoee eee ee ee 
Ee ey: ios | as.) WeeeO ed 8508 82.9 
ee ee 200 1280 169 94.0 84.5 
Cie, Vea as 201 | 197 | 182 98.0 90.5 
Dy Eee thts: See i98 >| 198 180 100.0 90.9 
Re ett ed | 123 123 104 100.0 84.5 
otal su seen 915 890 795 97.27 86.8 
Inbred (high fertility) 
A esol 198 Toe | 88.5 90.5 
Bene ee 73d 172 156 | 99.4 90.1 
Coie et | 204s 200 fet? |. 98:0 78.9 
WBA eh hs 197 193 joy || 0740 83.7 
5 See ere ers 169 145 | 96.5 82.8 
| 
Totals cowl | 950 932.1) gogiy' "| Ossie eibsoa 
Normals (not inbred) 
Ane Pieler cia D155 9) 5) Ot: Tes. | |) Beer 89.7 
Bae) ene 70 70) ou 48 | 100.0 68.5 
EOE | a Te | 153 152 igo. |. 9999 86.2 
De ee ee 224 21S) = 144. | O78 64.2 
| Rae pe) OES 158 155 144 | 98.1 91.1 
Ee ed eee Eee 146 ieee 109) | ©S7S7AMeIS Bevan 
CF ee oe 223 Die | 205 99.9 91.9 
Total sees 1189 1155 | 975 97.2 82.0 
